The difference between Builder and Constructor

Builder as a noun:

A person who builds or constructs things.

Builder as a noun (trade):

Master artisan, who receives his instructions from the architect, and employs workers.

Builder as a noun (rare, bodybuilding):

A bodybuilder.

Constructor as a noun:

A person who, or thing that, constructs.

Constructor as a noun (automotive):

A company or individual who builds racing vehicles. In Formula One, constructor status is strictly defined by the rules, but in other motorsports the term is merely a descriptor. Depending on the racing rules, some constructors (e.g. Cosworth) may provide vehicles to racing teams who are not themselves constructors, while others are both teams and constructors (Ducati Corse, Scuderia Ferrari).

Constructor as a noun (object-oriented programming):

A class method that creates and initializes each instance of an object.